MapActivity.java

public class MapActivity extends SherlockActivity {

    private LocationManager locationManager;
    Location location;
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    }

    @Override
    public boolean onOptionsItemSelected(com.actionbarsherlock.view.MenuItem item) {
        if (item.getItemId() == R.id.currentLocationPin) {

                if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
                    CurrentLocationListener listener = new CurrentLocationListener();
                    Criteria crit = new Criteria();
                    crit.setAccuracy(Criteria.ACCURACY_FINE);
                    String best = locationManager.getBestProvider(crit, false);
                    locationManager.requestLocationUpdates(best,1000, 10,listener);

                    if (location != null) {
                        Log.i("location", String.valueOf(location.getLatitude()));
                    } else {
                        Toast.makeText(getApplicationContext(),
                                "Waiting for location...", Toast.LENGTH_SHORT)
                                .show();
                    }
                } 
    }

}